Hand-screw or vise-jaw attachment



(No Model.)

' 13. SHAW.

HAND SCREW 0R VISE JAW ATTACHMENT.

No. 331,164. Patented Nov. 24,1885.

NITED STATES PATENT tribe.

EDGAR SHAW, OF LYNN, MASSACHUSETTS.

HAND-SCREW OR VlSE-JAW ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 331,16 dated November 24, 1885.

Application filed February 2, 1885.

.To all whom it may concern:

Be it known that I, EDGAR SHAW, of Lynn, in the county of Essex and State of Massachusetts, have invented certain Improvements in Hand-Screw or Vise- Jaw Attachments, of which the following is a specification.

This invention has for its object to provide an attachment or supplemental jaw for a handscrew or Vises capable of being readily inclined at any desired angle, so that the clamping-surfaces may be readily adapted to the surfaces of variously-formed bodies to be held.

To this end the invention consists in the improvements which I will now proceed to describe.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side View of a hand screw or clamp, one of the jaws of which is provided with my improvement. Fig. 2 represents a perspective View of my attachment and a portion of the jaw to which it is applied. Figs. 3 and 4. represent, respectively, an end view and a transverse section of the attachment as shown in Fig. 2. Fig. 5 represents a side elevation and partial section of a metal hand-screw having my improvement. Fig. 6 represents an end view of the construction shown in Fig. 5. Fig. 7 represents a top view of the plate as shown in Figs. 1, 2, 3, and 4, on which the attachment is supported.

The same letters of reference indicate the same parts in all the figures.

In carrying out my invention I provide a hand-screw or vise-jaw, a, with a fixed surface, b, which is composed of two faces, 2 2, which are inclined downwardly from the center of the surface Z: to the opposite edges transversely of the jaw a, as shown in Figs. 2, 3, 4, and 6, and are also inclinedlengthwise of the jaw, as shown in Figs. 1, 2, and 5. The surface 12 may be formed directly on the jaw, as shown in Figs. 5 and 6, or on a block, b, which is separable from said jaw, as shown in Figs. 1, 2, 3, 331(14. In the latter caseIprefer to provide the jaw with a metal plate, 6, having a T- shaped slot, f, to receive a correspondinglyshaped shank, g, on the block having the surface b, said shank being shown by dotted lines in Fig. 3. The block is thus enabled to be readily applied to and removed from the jaw.

On the surface I), I place a plate, i,'which is Serial No. 154,691. (No model.)

connected either to the jaw a or to the block b by a pivot-pin, is, having a rounded head, 7a, which is placed in a socket, Z, in thejaw a or the block b, and is capable of rocking or turning in any direction. The platet' is journaled on said pin, and is enabled thereby to rock on the apex or angle formed by the faces 2 2 and bear on either face, as shown in full and dotted lines in Fig. 4, thus enabling the outer face of the plate to be inclined in different directions. The plate is made with a varying thickness or wedges'haped', as clearly shown in Fig. 4, and is capable of rotating on or with the pin 70, so as to give other variations to the inclination of its outer face than those afforded by the faces 2 2. It will be seen, therefore, that the outer face of the plate 27, which constitutes one of the clamping-surfaces, is capable of assuming many different inclinations with relation to the other jaw or clamping-surface, and can therefore be made to conform to variously-formed bodies to be held.

The plate has an extended bearing on one of the faces 2 in any position in which it may be placed, and is therefore firmly supported, so that it cannot tip or wabble loosely, and is capable of sustaining a considerable degree of pressure without injury.

This improvement may be applied to both jaws, if desired, instead of to one only, as shown. It is capable of application to visejaws and other clamping devices, as welljas to hand-screws. It is obvious that the pivoted plate having the varying thickness, as shown, may be placed upon the flat surface of a clamping-jaw instead of on the surface b. If desired, the surface I) may be made without a longitudinal inclination.

I am aware that it is not new to provide a clamping-jaw with a pivoted wedge-shaped plate adapted to be rotated, and thereby vary the inclination of its outer face, said plate having projections on its rear side, which bear against the jaw and permit the pivoted plate to be inclined so as to assume either of two inclinations in any position to which it may be turned on its pivot. I am also aware that aring having two oppositely-incliued supporting-faces on its outer side has been pivoted to a vise-jaw so as to partly rotate and'support a face-plate adapted to rock on the apex of said faces with the same result. My improvement differs from those above referred to in that the oppositely-inclined faces 2 2 are fixed relatively to the jaw so that each partial rotation of the plate on its pivot changes its relation 5 to the fixed incline on which it bears. This result, I believe, has not before been accomjaw and oppositely inclined. transversely of the jaw, as set forth.

2. A clamping-j aw having a pivoted wedgeshaped plate and a supporting-surface forsaid plate, composed of two faces opposite y inclined transversely of the jaw and inclined lengthwise "of the jaw, as set forth.

3. The improved clamping-jaw attachment composed of the detachable block I), having the two-faced surface I), and the wedge-shaped plate z, connected to said block by a rocking pivot, 70, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this th day of January, 1885.

EDGAR SHAW.

Witnesses:

O. F. BROWN, H. BROWN. 

